it does look shaved... are those spots skin markings or scabs?
it could be a disorder that the cat has picked up and constantly scratches that area. you could try seeing where the cat goes/who owns it to ask them? it would only show you care enough to ask. or take the pic to the local vet and ask them?

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1.1.1 cats - Mowgli, Snowy & Scampi
1.0.0 crested gecko - Yoshi
1.0.0 boyfriend - Andy